Carly tutors students in math on the weekends and offers both thirty-minute sessions and sixty-minute sessions. She earns $15 for each thirty-minute session and $25 for each sixty-minute session
if she earned $230 this past weekend and had x thirty-minute sessions and I - 2 sloty-minute sessions, what is the value of x2
OA &
OB. 7
ОС. 5
OD 6
Please look at picture

Step-by-step explanation:

The amount she earns from 30 min sessions are 15x

The amount she earns from 60 min sessions are 25(x-2)

The total amount she earned is $230 from both sessions so,

15x + 25(x-2) = 230.

Expand,

15x + 25x - 50 = 230

Add 15x and 25x,

40x - 50 = 230

Add 50 to both sides,

40x - 50 + 50 = 230 + 50

40x = 280

Divide 40 from both sides,

40x/40 = 280/40

x = 7

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step-by-step explanation:

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the answer is b.

64

step-by-step explanation:

c=2πr=2·π·8≈64